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How can I customize the error message styling in Bootstrap form validation with input groups?

Asked on Dec 15, 2025

Answer

To customize error message styling in Bootstrap form validation with input groups, you can use custom CSS classes to override the default styles. Here's a simple example to get you started.

<!-- BEGIN COPY / PASTE -->
        <form class="needs-validation" novalidate>
            <div class="input-group mb-3">
                <span class="input-group-text" id="basic-addon1">@</span>
                <input type="text" class="form-control is-invalid" placeholder="Username" aria-label="Username" aria-describedby="basic-addon1" required>
                <div class="invalid-feedback">
                    Please choose a username.
                </div>
            </div>
        </form>
        <style>
            .invalid-feedback {
                color: #dc3545; /* Custom error color */
                font-weight: bold; /* Custom font weight */
            }
        </style>
        <!-- END COPY / PASTE -->

Additional Comment:

The `is-invalid` class is used to indicate an invalid input.
The `invalid-feedback` class is used for error messages, and you can customize it with CSS.
The `novalidate` attribute on the form disables native HTML5 validation to allow Bootstrap's custom validation.
Use the `aria-describedby` attribute to link the input with its feedback for accessibility.

✅ Answered with Bootstrap 5 best practices.

Ask any question about Bootstrap here... and get an instant response.

How can I customize the error message styling in Bootstrap form validation with input groups?

Asked on Dec 15, 2025

Answer

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